Cascade reservoir decision-making method giving consideration to spawning hydrological requirements of fishes laying drifting eggs

The invention discloses a cascade reservoir decision-making method giving consideration to spawning hydrological requirements of fishes laying drifting eggs. The method comprises the following steps: step 1, determining permissions of an environmental protection department and a power generation department in cascade reservoir dispatching and a relationship between the environmental protection department and the power generation department; 2, quantifying the proper ecological flow of spawning of typical drifting fishes based on an ecological hydraulics method, and constructing a scheduling target of an environmental protection department; step 3, constructing a cascade reservoir ecological optimization scheduling model giving consideration to power generation benefits and promoting spawning of drifting fishes based on a bilevel planning theory; and step 4, performing optimization solution on the ecological optimization scheduling model by combining a two-layer nested algorithm and a direct strategy search me